The worldwide £40,000 test
HMRC's manual asks whether you own, or are treated as owning, a major interest in another dwelling anywhere in the world at the end of the day of completion, and the condition is met where that interest is worth £40,000 or more at the date of the transaction. A half share of a family apartment in Madrid, a condo in Singapore or an inherited stake in a house abroad each puts a purchase in England or Northern Ireland into the higher rates column. Marriage widens the net: where one spouse buys alone, the transaction is still charged at the higher rates if the conditions would be met by either spouse, so retitling the purchase does not help. On joint purchases one buyer with a qualifying overseas share drags the whole transaction into the 5% column, so run the test against every name going on the transfer before exchange. The full rate tables and every test are in our guide to SDLT for expats and non-residents.
The main residence exception, and the refunds
The higher rates switch off when you are replacing your main residence, even if you keep other property around the world. If the old home is sold first, the new purchase completes at standard rates; if not, you pay the higher rates upfront and reclaim them once the old home sells within 36 months, with the claim due by the later of 12 months after the sale and 12 months after the filing date of the SDLT return. The home being replaced does not have to be in the UK: selling a genuine main residence overseas and buying in England can qualify. Whether that overseas sale is itself taxed in the UK is a separate question, covered in our guide to Private Residence Relief.
The 2% non-resident surcharge stacks on top
Owning property abroad often travels with living abroad, and that brings the second layer: a 2% surcharge on the whole price where the buyer was present in the UK on fewer than 183 days in the 12 months before completion. This test has nothing to do with the Statutory Residence Test, so a British citizen working overseas normally pays it. It is refundable if you move to the UK and are present for 183 days in a continuous 365 day period within the qualifying window, claimed by amending the SDLT return within 2 years of completion, and where spouses buy together one UK resident spouse shelters both. Conveyancers calculate SDLT from the answers you give them and rarely interrogate a worldwide property list or a day count, which is exactly the gap that produces five figure errors; our guide to how non-residents hold UK property covers the running and exit taxes that follow the purchase. Horizon confirms your position under both tests in writing before exchange and prepares refund claims, on a fixed fee agreed upfront; if you have a completion date in the diary, book a free 30 minute clarity call.